Nanoscale Detection of Magnon Excitations with Variable Wavevectors Through a Quantum Spin Sensor.
basic_science · Level V
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- Record sourced from PubMed, PMID 32297750.
- Also identified by DOI 10.1021/acs.nanolett.0c00085.
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Abstract
We report the optical detection of magnons with a broad range of wavevectors in magnetic insulator Y<sub>3</sub>Fe<sub>5</sub>O<sub>12</sub> thin films by proximate nitrogen-vacancy (NV) single-spin sensors. Through multimagnon scattering processes, the excited magnons generate fluctuating magnetic fields at the NV electron spin resonance frequencies, which accelerate the relaxation of NV spins. By measuring the variation of the emitted spin-dependent photoluminescence of the NV centers, magnons with variable wavevectors up to ∼5 × 10<sup>7</sup> m<sup>-1</sup> can be optically accessed, providing an alternative perspective to reveal the underlying spin behaviors in magnetic systems. Our results highlight the significant opportunities offered by NV single-spin quantum sensors in exploring nanoscale spin dynamics of emergent spintronic materials.